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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments $ 4,172,451   $ 4,172,451   $ 3,515,566
Other liabilities 3,457   3,457   2,742
Debt 1,935,928   1,935,928   1,958,655
Long-term debt, fair value 1,900,000   1,900,000   1,900,000
Net Investment Income | Term Loans          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net unrealized (losses) gains recognized in earnings 208,500 $ 20,200 197,100 $ 100,600  
Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments 4,172,451   4,172,451   3,515,566
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments 2,044,080   2,044,080   1,942,199
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Direct private equity investments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments 148,005   148,005   0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Term Loans          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments 0   0   0
Significant Other Observable Inputs (Level 2) | Quoted Prices | Fair Value, Measurements, Recurring | Direct private equity investments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments 148,000   148,000  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments 145,609   145,609   157,563
Other liabilities 497   497   515
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Direct private equity investments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments 51,034   51,034   59,905
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Term Loans          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments 94,575   94,575   97,658
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other liabilities 497   497   515
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Direct private equity investments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments 51,034   51,034   59,905
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Term Loans          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments $ 94,600   $ 94,600   $ 97,700
U.S. Treasuries          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 3.70%   3.70%   4.10%
Corporate          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 5.10%   5.10%   5.70%
Agencies          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 4.50%   4.50%   4.60%
Non-U.S. Government          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 4.10%   4.10%   4.40%
Residential Mortgage-backed          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 4.80%   4.80%   5.10%
Weighted average life     7 years 3 months 18 days   7 years 8 months 12 days
Commercial Mortgage-backed          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 5.80%   5.80%   8.80%
Weighted average life     3 years 9 months 18 days   2 years 2 months 12 days
Asset-backed          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 6.20%   6.20%   7.00%
Weighted average life     4 years 6 months   3 years 10 months 24 days
Short Term Investments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 4.20%   4.20%   5.30%
Other Short Term Investments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 4.80%   4.80%   5.30%
Private Credit Funds | Minimum          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Liquidation period for fund assets     5 years    
Private Credit Funds | Maximum          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Liquidation period for fund assets     10 years    
Direct private equity investments | Minimum          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Liquidation period for fund assets     5 years    
Direct private equity investments | Maximum          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Liquidation period for fund assets     10 years